<?php

/********************************************************************************\
 * Copyright (C) Carl Taylor (cjtaylor@adepteo.com)                             *
 * Copyright (C) Torben Nehmer (torben@nehmer.net) for Code Cleanup             *
 * Licensed under the BSD license upon request                                  *
\********************************************************************************/

/// Enable multiple timers to aid profiling of performance over sections of code

/**
 * -----------| Execution time profiler |-----------
 * @category Betterlife
 * @package core.main
 * @subpackage helper
 * @author skygreen2001 <skygreen2001@gmail.com>
 */
class Profiler
{
    var $description;
    var $startTime;
    var $endTime;
    var $initTime;
    var $cur_timer;
    var $stack;
    var $trail;
    var $trace;
    var $count;
    var $running;

    protected static $inst;

    /**
    * Initialise the timer. with the current micro time
    */
    function Profiler($output_enabled = false, $trace_enabled = false)
    {
        $this->description = array();
        $this->startTime   = array();
        $this->endTime     = array();
        $this->initTime    = 0;
        $this->cur_timer   = "";
        $this->stack       = array();
        $this->trail       = "";
        $this->trace       = "";
        $this->count       = array();
        $this->running     = array();
        $this->initTime    = $this->getMicroTime();
        $this->output_enabled = $output_enabled;
        $this->trace_enabled  = $trace_enabled;
        $this->startTimer('未监控耗时');
    }

    // Public Methods

    static function init()
    {
        if (!self::$inst) {
            self::$inst = new Profiler(true, true);
        }
    }

    static function mark($name, $level2 = "", $desc = "")
    {
        if ($level2 && $_GET['debug_profile'] > 1) {
            $name .= " $level2";
        }

        if (!self::$inst) {
            self::$inst = new Profiler(true, true);
        }

        self::$inst->startTimer($name, $desc);
    }
    static function unmark($name, $level2 = "", $desc = "")
    {
        if ($level2 && $_GET['debug_profile'] > 1) {
            $name .= " $level2";
        }

        if (!self::$inst) {
            self::$inst = new Profiler(true, true);
        }

        self::$inst->stopTimer($name, $desc);
    }
    static function show($showTrace = false)
    {
        if (!self::$inst) {
            self::$inst = new Profiler(true, true);
        }

        echo "<div style=\"position: absolute; z-index: 100000; top: 20px; left: 20px; background-color: white; padding: 20px; border: 1px #AAA solid; height: 80%; overflow: auto;\">";
        echo "<p><a href=\"#\" onclick=\"this.parentNode.parentNode.style.display = 'none'; return false;\">(Click to close)</a></p>";
        self::$inst->printTimers();
        if ($showTrace) {
            self::$inst->printTrace();
        }
        echo "</div>";
    }

    /**
     *   Start an individual timer
     *
     *   This will pause the running timer and place it on a stack.
     *   @param string $name name of the timer
     *   @param string optional $desc description of the timer
     */
    function startTimer($name, $desc = "")
    {
        $this->trace .= "start   $name\n";
        $n            = array_push($this->stack, $this->cur_timer);
        $this->__suspendTimer($this->stack[$n - 1]);
        $this->startTime[$name]   = $this->getMicroTime();
        $this->cur_timer          = $name;
        $this->description[$name] = $desc;
        if (!array_key_exists($name, $this->count)) {
            $this->count[$name] = 1;
        } else {
            $this->count[$name]++;
        }
    }

    /**
     *   Stop an individual timer
     *
     *   Restart the timer that was running before this one
     *   @param string $name name of the timer
     */
    function stopTimer($name)
    {
        $this->trace .= "stop    $name\n";
        $this->endTime[$name] = $this->getMicroTime();
        if (!array_key_exists($name, $this->running)) {
            $this->running[$name] = $this->elapsedTime($name);
        } else {
            $this->running[$name] += $this->elapsedTime($name);
        }
        $this->cur_timer = array_pop($this->stack);
        $this->__resumeTimer($this->cur_timer);
    }

    /**
     *   measure the elapsed time of a timer without stoping the timer if
     *   it is still running
     */
    function elapsedTime($name)
    {
        // This shouldn't happen, but it does once.
        if (!array_key_exists($name, $this->startTime)) {
            return 0;
        }

        if (array_key_exists($name, $this->endTime)) {
            return ($this->endTime[$name] - $this->startTime[$name]);
        } else {
            $now = $this->getMicroTime();
            return ( $now - $this->startTime[$name] );
        }
    }//end start_time

    /**
     *   Measure the elapsed time since the profile class was initialised
     *
     */
    function elapsedOverall()
    {
        $oaTime = $this->getMicroTime() - $this->initTime;
        return($oaTime);
    }//end start_time

    /**
     *   print out a log of all the timers that were registered
     *
     */
    function printTimers($enabled = false)
    {
        if ($this->output_enabled || $enabled) {
            $TimedTotal = 0;
            $tot_perc   = 0;
            ksort($this->description);
            print("<pre>\n");
            $oaTime     = $this->getMicroTime() - $this->initTime;
            echo"============================================================================\n";
            echo "                              PROFILER OUTPUT\n";
            echo"============================================================================\n";
            print( "Calls                    Time  Routine\n");
            echo"-----------------------------------------------------------------------------\n";
            while (list ($key, $val) = each($this->description)) {
                // $t     = $this->elapsedTime($key);
                $total       = $this->running[$key];
                $count       = $this->count[$key];
                $TimedTotal += $total;
                $perc        = ($total / $oaTime) * 100;
                $tot_perc   += $perc;
                // $perc=sprintf("%3.2f", $perc );
                $lines[ sprintf("%3d    %3.4f ms (%3.2f %%)  %s\n", $count, $total * 1000, $perc, $key) ] = $total;
            }
            arsort($lines);
            foreach ($lines as $line => $total) {
                echo $line;
            }

            echo "\n";

            $missed    = $oaTime - $TimedTotal;
            $perc      = ($missed / $oaTime) * 100;
            $tot_perc += $perc;
            // $perc=sprintf("%3.2f", $perc );
            printf("       %3.4f ms (%3.2f %%)  %s\n", $missed * 1000, $perc, "Missed");

            echo"============================================================================\n";

            printf("       %3.4f ms (%3.2f %%)  %s\n", $oaTime * 1000, $tot_perc, "OVERALL TIME");

            echo"============================================================================\n";

            print("</pre>");
        }
    }

    function printTrace($enabled = false)
    {
        if ($this->trace_enabled || $enabled) {
            print("<pre>");
            print("Trace\n$this->trace\n\n");
            print("</pre>");
        }
    }

    /// Internal Use Only Functions

    /**
     * Get the current time as accuratly as possible
     *
     */
    function getMicroTime()
    {
        $tmp = explode(' ', microtime());
        $rt  = $tmp[0] + $tmp[1];
        return $rt;
    }

    /**
     * resume  an individual timer
     *
     */
    function __resumeTimer($name)
    {
        $this->trace            .= "resume  $name\n";
        $this->startTime[$name]  = $this->getMicroTime();
    }

    /**
     *   suspend  an individual timer
     *
     */
    function __suspendTimer($name)
    {
        $this->trace          .= "suspend $name\n";
        $this->endTime[$name]  = $this->getMicroTime();
        if (!array_key_exists($name, $this->running)) {
            $this->running[$name] = $this->elapsedTime($name);
        } else {
            $this->running[$name] += $this->elapsedTime($name);
        }
    }
}
